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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e305dd1ef041816b8545ef0810ba104556309a80b5bb5544c41e4d3cc81eafac' 
  AND token = 'jvr6S3QXX7bUHWffjBQx7A53fzPjxL58IVVO1vx/UPo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}